<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* css reset 样式重置 */
        * {
            margin: 0;
            padding: 0;
        }

        body,
        html {
            height: 100%;

        }

        body {
            /* 手机网页  apple-system */
            /* css 继承 */
            font-family: -apple-system-font, sans-serif;
            background-color: red;
        }

        .page {
            position: absolute;
            /*  格式化上下文  绝对定位, 脱离了文档流 */
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            overflow-y: auto;
            /*内部滚动*/
            -webkit-overflow-scrolling: touch;
            /* 让我们的滚动如丝般顺滑*/
        }

        .page__hd {
            height: 200vh;
            /*vh 相对viewport（视窗）单位  */


        }
    </style>
</head>

<body>
    <div class="page">
        <div class="page__hd">
            <div class="page__title">Flex</div>
            <div class="page__desc">Flex布局</div>
        </div>
        <!-- BEM -->
        <div class="page__bd padding__bd_spacing">
            <!-- weui 项目前缀，弹性布局组件 新一轮的BEM -->
            <div class="weui-flex">
                <div class="weui-flex__item">
                    <div class="placeholder">weui</div>
                </div>
            </div>
        </div>
        <div class="page__ft">
            <a href="javascript:home()">

            </a>
        </div>
    </div>
</body>

</html>